Tinkering is a very niche card that has had some use out of decks using Rielle "Kit" Peddler: Transhuman or maybe Quetzal: Free Spirit(Though the influence would be very tight then) to get more out of their base abilities. Paintbrush Kit it hasn’t really seen a lot of use, which maybe should be thought about in a different light.

The big thing that is often overlooked on Tinkering is that it does not have to be on a rezzed piece of ICE. Any ICE can be targeted with Tinkering, even unrezzed pieces, giving the runner quite an opportunity. It becomes a Shaper version of Inside Job, when the runner only has a single breaker out. Certainly no where near as effective, and without knowing what the ICE is trying to calculate the cost of the run is very difficult, but there are ways around those issues.

Though it has not seen a lot of play, it is certainly a card worth re-looking at and considering again in a different light. If seen early enough it can help get into servers the corp thought were safe, and even late game it can allow more efficient breakers to work on ICE that is costly to get through for another type.

(Written during the meta of Breaker Bay, part of the SanSan Cycle. For more reviews like it, visit wyldside.blogspot.com)

Agreed, this card is underplayed. It's fantastic early game to bust into a server that the Corp thought was safe. Even lategame it can be an econ card - eg to make an expensive sentry ice into a code gate for Study Guide, Refractor or Gordian Blade to breeze through.
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Ber11 May 2015

It can also be a sneaky way to break an abnormal ice, like a Trap or a Mythic, that otherwise might not be breakable with a traditional breaker suite--say, to get 2+ runs on a turn despite an Excalibur, to avoid a Universal Connectivity Fee, or to break a Mother Goddess with no other rezzed ice.
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Comfect11 May 2015

Also a fairly good splash for decks running surfer
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geekywhale21 Oct 2015

The other big thing that's often overlooked is that it says until the end of the TURN, so you can potentially hit a central three times through the tinkered ICE. Not to mention that if you're using Snowball as your Fracter and the corp put something in front of a piece of natural Barrier ICE...
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LordRandomness2 Jun 2016